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The title of this volume is one that should bring an eager sparkle to the eyes of your aerodynamic friends. Both turbulence and heat transfer are topics of major practical importance, and for engineering purposes they share a common basis of empiricisms, regarded with justifiable suspicion by fundamental research workers, but on which useful working formulae have been developed. Meanwhile, the said research workers have pursued thoroughgoing scientific investigations into the phenomenon of turbulence and although as yet no important practical applications appear to have resulted from their work they have built up a body of knowledge which has its own intrinsic value and which will undoubtedly have important applications in the future. Good books on these topics are very rare, hence the interest which this title will arouse in aerodynamic circles. An optimist will expect the book to provide him with a complete and ordered survey of both the fundamental and applied lines of development, with appropriate critical comments, and he will expect to find the answers to many of the current problems with which he may be concerned. His expectations will not be entirely fulfilled, the arrangement is not as well ordered as it might be and the writing was largely completed in 1956, so that more recent developments and problems are not dealt with. Such defects are however inevitable in a collection of articles of this kind dealing with a rapidly developing group of subjects, and there is much of value in the book.